TWI706717B - Shears comprising a first and a second shear part - Google Patents

Abstract

The invention relates to shears, in particular pruning shears or secateurs (1), comprising a first shear part (3) and a second shear part (3’). Each of the first and second shear parts (3, 3) have a cutting blade (11, 11’) and a shaft or lever arm (5, 5’) which are arranged at opposite sides of a pivot (7) which rotatably connects the first and second shear parts (3, 3’) with each other. The shears further comprise a laminated or flat spring element (27) acting upon the first and second shear parts (3, 3’) to move the shears on to an open position. The laminated or flat spring element (27) comprises a first portion (27’) fixedly arranged at or allocated to the first shear part (3) and a flexibly arranged second portion (27”) acting on the second shear part (3’). In order to provide a movement of the laminated or flat spring element (27) on a contacting surface at the second shear part (3’) without or with only very low friction, thus avoiding occurrence of noise or abrasion, the second shear part (5’) comprises a rounded surface or curve at a contraction area which constitutes the touching zone between the second shear part (5’) and the laminated or flat spring element (27).

Description

Scissors including first cutting part and second cutting part

The present invention relates to the field of scissors, and particularly refers to a pruning shear or trimmer.

For the purpose of cutting, scissors usually include a first cutting part and a second cutting part. Both cutting parts include a cutting blade and a shaft or a lever arm arranged on opposite sides of a hinge. The hinge is respectively connected with the first shearing part and the second shearing part in a rotatable manner.

Specific scissors such as pruning shears or trimmers include a spring element that provides an opening force for the first cutting part and the second cutting part to allow the scissors to be in an open position and start subsequent cutting operations. For example, a trimmer in the patent DE 3426577 A1 includes a flat spring element acting on the first and second cutting parts to move the scissors to an open position. The flat spring element is fixedly provided with a first end portion on the first shearing portion, wherein the first end portion is clamped between two pins that are laterally offset from each other and the inner surface of the handle. The second end portion of the flat spring element elastically acts on the second shearing portion and exerts a spring force for turning on the trimmer.

According to the patent DE 3426577 A1, the flat spring element and the second shearing part of the trimmer are made of metal. During cutting and opening operations, there will be sliding motions between these components. After several operations, noise will start to be generated due to wear, or the surface of the flat spring element will be corroded.

Therefore, the object of the present invention is to overcome the above-mentioned shortcomings and provide movement of laminated or flat spring elements with little or no friction on a contact surface of the second shearing portion to avoid noise or wear.

The scissors provided by the present invention can overcome the shortcomings of the conventional solutions described in the prior art, especially the pruning shears or trimmers according to the technical features of claim 1 of the present invention.

The scissors according to the present invention include a first cutting part and a second cutting part. The first cutting part and the second cutting part respectively include a cutting blade and a shaft or a shaft arranged on opposite sides of a hinge. The lever arm and the hinge are respectively rotatably connected with the first shearing part and the second shearing part to allow the scissors to move from an open position to a closed position, and return from the closed position to the open position. The scissors further include a laminated or flat spring element that acts on the first cutting portion and the second cutting portion to move the scissors to the open position, so that the operator of the scissors only needs to perform the closing action and follow-up The cutting operation performed by it. The laminated or flat spring element includes a first part fixedly arranged or arranged on the first shearing part, and a second part elastically arranged and acting on the second shearing part. In order to configure the laminated or flat spring element to have only extremely low friction, the second shearing portion includes a rounded surface or curved surface in a contact area where the second shearing portion and the layer A touch area is formed between the pressing or flat spring elements.

The circular surface or curved surface and the laminated or flat spring element can be designed and/or configured and/or interact with each other when the scissors are opened and closed. The circular surface or curved surface of the second shearing portion The rolling movement is performed at least partly on the laminated or flat spring element. It is also possible to provide a circular surface or curved surface on the laminated or flat spring element, especially due to the bending, the individual circular or curved surfaces of the laminated or flat spring element and the second shearing portion can be Match each other. According to common knowledge, rolling friction is much smaller than sliding friction, so wear will be significantly reduced. Through the above configuration, the axial force acting on the laminated or flat spring element can be minimized.

Preferably, the present invention includes a lubricator for providing uninterrupted or regular lubrication to the contact area. No matter in the case of sliding or rotating friction, the lubrication of the two surfaces in the contact area can reduce friction and decisively support avoiding wear. In addition, the lubricated surfaces usually produce no noise during the mutual movement of the contact surfaces.

In a preferred embodiment, the circular surface or curved surface enters a gap or groove, and an end portion of the laminated or flat spring element extends into the gap or groove when the scissors are in the open position, The gap or groove provides space for the end portion. This embodiment can also provide for the round surface or curved surface and the laminated or flat spring element to be designed and/or configured to cooperate with each other so as to allow the laminated or flat spring to be opened and closed when the scissors are opened and closed. The end portion of the element turns in and out from the gap or groove.

The gap or groove can be designed as a bag filled or can be filled with grease or any kind of lubricant, thereby creating a grease or lubricant storage tank. Preferably, the end portion of the laminated or flat spring element is adapted to snap into the grease or lubricant storage groove, thereby lubricating the surface of the end portion. The buckle process works when the scissors are opened.

In a preferred embodiment, the pocket is designed to retain the grease or lubricant only by the low interfacial tension between the grease or lubricant and the inner surface of the pocket. Utilizing such physical characteristics, the grease or lubricant storage tank will not be discharged, not to mention that the end portion of the laminated or flat spring element will often engage with the pocket, so that the pocket cannot be closed when the scissors are opened. Allow the user of the scissors to use it in any direction.

A more specific embodiment of the present invention is characterized in that the laminated or flat spring element and the grease or lubricant storage groove are arranged in a mutual arrangement so that only the end portion of the laminated or flat spring element is suitable for snapping into the lubrication Grease or lubricant storage tank. The grease or lubricant covering the end portion is transferred to the contact area with low interfacial tension. Additionally or alternatively, the inner surface of the bag and the surface of the laminated or flat spring element facing the surface of the bag may be spaced apart from each other under a small gap, and the grease or lubricant may be transferred to by capillary action The contact area.

1‧‧‧Pruning machine

3‧‧‧The first cut part

3’‧‧‧Second cut part

5. 5’‧‧‧Lever arm

7‧‧‧ Hub

9, 9’‧‧‧Handle

11, 11’‧‧‧Cutting blade

13‧‧‧Linked skateboard components

13’‧‧‧Operator

13"‧‧‧Latch

15‧‧‧Gap

17‧‧‧Brake element

19‧‧‧Hole

21‧‧‧Bottom

23‧‧‧Cutting edge

25‧‧‧Outstanding

27‧‧‧Flat spring element

27’‧‧‧The first part of the flat spring element

27"‧‧‧The second part of the flat spring element

29‧‧‧Gap

29’, 29”‧‧‧Gap side

31‧‧‧Slot

33‧‧‧fulcrum

35‧‧‧Bag Department

37‧‧‧hook

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. The drawings include: Figure 1 is a schematic side view illustrating the trimmer of the present invention in a closed state; Figure 2 is a schematic diagram illustrating the first of the present invention. Figure 3 is a schematic cross-sectional view of the trimmer in Figure 1 along the line AA in Figure 2; Figure 4 is a schematic view of the exploded trimming with a flat spring in Figure 1 of the present invention Figure 5 is a schematic rear perspective view illustrating the trimmer with a removable handle in Figure 1 of the present invention; and Figure 6 is a schematic view illustrating the trimmer of Figure 1 of the present invention in Figure 3 but It is a schematic cross-sectional view of the open position.

As shown in Figure 1, the trimmer 1 is made of metal and is composed of a first cutting part 3 and a second cutting part 3'which are connected to each other by a hinge 7. The hinge 7 is, for example, a screw and a Corresponding nut or similar. Each of the first cutting portion 3 and the second cutting portion 3'includes a lever arm 5, 5', and each lever arm 5, 5'is respectively combined with a cutting blade 11, 11' and made of plastic or A handle 9, 9'made of rubber and used to grasp and operate the trimmer 1, lever arms 5, 5'and cutting blades 11, 11' are all arranged on opposite sides of the hub 7.

In order to store or transport the trimmer 1 safely, it can be set in an idle or closed position as illustrated in Figures 1 to 5. In order to ensure the idle or closed position, an interlocking sliding plate element 13 movable in the longitudinal direction of the handle 9'is arranged on the handle 9'of the second cutting part 3'. The interlocking slide element 13 is composed of an operating device 13' for moving and a latch 13". The latter is a gap between the lever arm 5 disposed in the first shearing part 3 when the trimmer 1 is in the idle or closed position 15 Interaction. By removing the latch 13" from the notch 15 to move the interlocking slide element 13 to the opposite longitudinal direction, the trimmer 1 will enter its open or operating position, as shown in Figure 6. As can be seen most clearly in Figure 3, when the trimmer 1 is turned off again and the cutting action has been performed, a first brake element 17 on the lower handle 9 of the first cutting part 3 will be pushed into the pocket , And the handle 9'of the second cutting portion 3'hits the top end of the first stopper element 17 to define the stop of the cutting operation. The hole 19 that allows the hanging and storage of the trimmer 1 is provided at the end portion of the handle 9'of the second cutting part 3'. For example, the trimmer 1 can be hung on a wall hook through the hole 19.

By rotating the first and second shearing parts 3, 3'connected by the hinge 7, the cutting operation of the trimmer 1 usually starts when the trimmer 1 is in the open position, especially as shown in Figure 6. Open position. The operator uses the lever effect to perform a closing movement on the cutting blades 11, 11' via the handles 9, 9'to express a high cutting force. The fully open position is defined by a bottom surface 21 of the cutting blade 11' of the second cutting part 3'hitting a protrusion 25 of a second setter element arranged at the handle 9 of the first cutting part 3. The bottom surface 21 faces a cutting edge 23 of the cutting blade 11' of the second cutting portion 3'.

The opening position for starting the cutting operation is achieved by the opening force generated by a spring element, which may be a flat spring element 27, as shown in FIGS. 3-6. The flat spring element 27 is arranged at the handle 9 of the first shearing part 3, and is fixed in the radial direction of a first part 27' of the flat spring element 27 by the corresponding groove 31 provided on the inner surface of the handle 9 Direction and/or lateral direction. Adjacent to the first part 27', a second part 27" of the flat spring element 27 is elastically arranged to exert a spring force on the second shearing part 3'so as to pass by the distance between the open and closed positions A defined short-range movement of the spring. In order for the flat spring element 27 to perform this short-range movement, the handle 9 provides a respective space or gap 29.

Figure 6 shows the almost unstressed state obtained by the flat spring element 27 in the fully open position of the trimmer 1. In this state, although the flat spring element 27 is shown in a straight line as shown in Fig. 4, the exploded view of Fig. 4 reflects the flat spring element 27 in its stressed state, especially when the trimmer 1 is in the closed position. In the unstressed position, the flat spring element 27 adopts a curved shape with a large and constant radius (refer to Fig. 6). As can be understood from Fig. 6, in order to fit into the linear groove 31, the first portion 27' of the flat spring element 27 arranged in the groove 31 is regarded as a linear arrangement. However, when the first part 27' of the flat spring element 27 is to be disassembled from the groove 31, the radius of curvature of the second part 27" is to follow. When it is to be installed into the groove 31, the first part 27' is straightened to implement a The clamping force reaches the limiting side or wall of the groove, thereby supporting the fixing force of the flat spring element 27 and keeping it in position.

The flat spring element 27 is fixed in the radial and/or lateral direction by the groove 31, and is on the slot side by the side surface of the lever arm 5. The arrangement of the groove 31 and the lever arm 5 creates a space for the first part 27' of the flat spring element 27, and this arrangement is for safe and firm positioning to prevent the flat spring element 27 from twisting or twisting in the radial and/or lateral directions. Movement without any gaps.

The flat spring element 27 is also fixed to prevent movement in the direction of the first axis of the hub 7. To this end, one end portion of the flat spring element 27 also becomes the end portion of the first portion 27' of the flat spring element 27, and the end portion of the first portion 27' of the flat spring element 27 is bent into a rounded corner so as to be at a right angle.结构hook 37. The hook 37 abuts against the tail of the lever arm 5 to prevent movement in the first axis direction.

Finally, the flat spring element 27 is also fixed in a second axis direction away from the hub 7, and movement in this direction is restricted by an end wall of the slot 31 approximately located close to the tail of the lever arm 5, thereby retaining the hook 37 Of receiving space.

The flat spring element 27 is configured on the trimmer 1 in a removable and exchangeable manner, so that when the flat spring element 27 is damaged, the operator can replace it. The assembly of the flat spring element 27 is performed in the manner shown in FIG. 4. First, the flat spring element 27 is separated from the trimmer 1 as shown in Fig. 4. However, as described above, Fig. 4 shows the flat spring element 27 in a straightened state. As shown in Figure 5, the flat spring element 27 is then attached to the lever arm 5 of the first shearing portion 3, and at least the first portion 27' of the flat spring element 27 is directed parallel to the axis of the lever arm 5. After such a configuration, the handle 9 is slidably added to the lever arm 5, and the flat spring element 27 pushes its opening end in the front space or gap 29, for example, the handle 9 is moved from the end portion of the lever arm 5 along the lever arm 5 , Until the handle 9 reaches its final position. The hook 37 surrounds the tail of the lever arm 5 to ensure that the flat spring element 27 remains in place and does not move when the handle 9 slides on the lever arm 5. Through the aforementioned components, when the flat spring element 27 is introduced into the groove 31 on the handle 9', the flat spring element 27 is also firmly fixed.

The lever arm 5'of the second shearing part 3'is formed by providing a fulcrum 33 closer to the hub 7, and the second end part 27" of the flat spring element 27 continuously presses the fulcrum 33 so that the second shearing part 3 The spring force is applied to turn on the trimmer 1. The fulcrum 33 is designed by a circular contact surface for smooth contact with the second end portion 27" of the flat spring element 27. The trimmer 1 is only turned on at an angle of about 40 degrees. When the trimmer 1 is in the open position, the surface of the fulcrum 33 points toward the flat spring element 27 by turning an angle of about 65 degrees, so that the second end of the flat spring element 27 The portion 27" extends into the recess of the pocket 35 (refer to Fig. 6).

The pocket 35 is filled with lubricant (not shown), especially grease. The structure of the trimmer 1 and its pocket 35 are designed to allow the user of the trimmer 1 to repeatedly fill the pocket 35 with lubricant.

During the opening movement of the trimmer 1 from the closed position (refer to FIG. 3) to the open position (refer to FIG. 6), the end portions of the flat spring element 27 are arranged as opposed end portions to form a hook 37, and the flat spring element 27 Lubricant is buckled in to lubricate the flat spring element 27 at its contact surface with the pivot 33. The lubricant can flow directly to the contact area, or it can be driven from the pocket 35 to the contact area by the low interface tension between the lubricant and the flat spring element 27.

1‧‧‧Pruning machine

3‧‧‧The first cut part

3’‧‧‧Second cut part

5’‧‧‧Lever Arm

7‧‧‧ Hub

9, 9’‧‧‧Handle

11, 11’‧‧‧Cutting blade

13’‧‧‧Operator

17‧‧‧Brake element

19‧‧‧Hole

21‧‧‧Bottom

23‧‧‧Cutting edge

25‧‧‧Outstanding

27‧‧‧Flat spring element

27’‧‧‧The first part of the flat spring element

27"‧‧‧The second part of the flat spring element

29‧‧‧Gap

29"‧‧‧Gap side

31‧‧‧Slot

33‧‧‧fulcrum

35‧‧‧Bag Department

Claims (8)

A scissors, comprising a first cutting part (3) and a second cutting part (3'), the first cutting part (3) and the second cutting part (3') respectively include a A cutting blade (11, 11') and a shaft or a lever arm (5, 5') on the opposite side of the hub (7), the hub (7) is connected to the first shearing portion (3) and the second The cutting parts (3') are rotatably connected to each other, and the scissors further include a layer acting on the first cutting part (3) and the second cutting part (3') to move the scissors to an open position Compression or flat spring element (27), the laminated or flat spring element (27) includes a first part (27') fixedly arranged or arranged on the first shearing part (3), and is elastically arranged and acting In a second portion (27") of the second shearing portion (3'), wherein the second shearing portion (3') includes a circular surface or a curved surface in a contact area, and the contact area is in the first A touch area is formed between the two shearing parts (3') and the laminated or flat spring element (27), which is characterized in that: the round surface or curved surface enters a gap or groove, the laminated or flat spring An end portion of the element (27) extends into the gap or groove at least in an open position of the scissors, wherein the circular surface or curved surface and the laminated or flat spring element (27) are designed and configured to each other When the scissors are opened and closed, the end portion of the laminated or flat spring element (27) is turned into and out of the gap or groove, and the gap or groove is filled with grease or lubricant A bag part (35) of the battery, thereby establishing a grease or lubricant storage tank. The scissors described in item 1 of the scope of patent application, wherein the round surface or curved surface and the laminated or flat spring element (27) are each designed and configured to form the second shear when the scissors are opened and closed The circular surface or curved surface of the portion (3') at least partially performs a hydraulic movement on the laminated or flat spring element (27). Such as the scissors described in item 1 or item 2 of the scope of patent application, wherein a lubricator is provided for continuous or frequent lubrication of the contact area. The scissors according to the first item of the patent application, wherein the end portion of the laminated or flat spring element (27) is adapted to be buckled into the grease or lubricant storage groove. Such as the scissors described in item 4 of the scope of patent application, wherein the buckling process occurs when the scissors are opened. The scissors described in item 1, 4, or 5 of the scope of the patent application, wherein the pocket (35) is designed to only pass between the grease or lubricant and the inner surface of the pocket (35) The low interfacial tension keeps the grease or lubricant in it. The scissors according to item 1, 4, or 5 of the scope of patent application, wherein the laminated or flat spring element (27) and the grease or lubricant storage groove have a mutual arrangement, so that only the laminated or flat spring The end portion of the element (27) is adapted to be buckled into the grease or lubricant storage groove, and the grease or lubricant covering the end portion is transferred to the contact area by low interfacial tension. Such as the scissors described in item 1, 4 or 5 of the scope of patent application, wherein, at least when the scissors are in the open position and the grease or lubricant is transferred to the contact area by capillary action or effect, the gap or recess The inner surface of the groove and the surface of the laminated or flat spring element (27) facing the surface of the gap or groove may be spaced apart from each other under a small gap.

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